/Engine/Source/Editor/MovieSceneTools/Public/KeyframeTrackEditor.h
Returns whether a section was added
[FKeyPropertyResult](API\Editor\Sequencer\FKeyPropertyResult) AddKeysToSection ( [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * Section, [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) KeyTime, const FGeneratedTrackKeys & Keys, ESequencerKeyMode KeyMode, EKeyFrameTrackEditorSetDefault SetDefault )